Fix typecheck error: use typeof string check instead of Array.isArray for ReadonlyArray

Co-authored-by: mrlubos <12529395+mrlubos@users.noreply.github.com>

Author: Copilot

packages/openapi-python/src/generate/__tests__/client.test.ts

@@ -5,9 +5,10 @@ import path from 'node:path';
  */
 function outputHeaderToPrefix(header: unknown): string {
   if (header == null || typeof header === 'function') return '';
-  const lines = Array.isArray(header)
-    ? (header as string[]).flatMap((line) => line.split(/\r?\n/))
-    : (header as string).split(/\r?\n/);
+  const lines =
+    typeof header === 'string'
+      ? header.split(/\r?\n/)
+      : (header as string[]).flatMap((line) => line.split(/\r?\n/));
   const content = lines.join('\n');
   return content ? `${content}\n\n` : '';
 }

packages/openapi-python/src/generate/client.ts

@@ -60,9 +60,10 @@ function getClientBundlePaths(pluginName: string): {
  */
 function outputHeaderToPrefix(header: OutputHeader): string {
   if (header == null || typeof header === 'function') return '';
-  const lines = Array.isArray(header)
-    ? header.flatMap((line) => line.split(/\r?\n/))
-    : header.split(/\r?\n/);
+  const lines =
+    typeof header === 'string'
+      ? header.split(/\r?\n/)
+      : header.flatMap((line) => line.split(/\r?\n/));
   const content = lines.join('\n');
   return content ? `${content}\n\n` : '';
 }

packages/openapi-ts/src/generate/__tests__/client.test.ts

@@ -5,9 +5,10 @@ import path from 'node:path';
  */
 function outputHeaderToPrefix(header: unknown): string {
   if (header == null || typeof header === 'function') return '';
-  const lines = Array.isArray(header)
-    ? (header as string[]).flatMap((line) => line.split(/\r?\n/))
-    : (header as string).split(/\r?\n/);
+  const lines =
+    typeof header === 'string'
+      ? header.split(/\r?\n/)
+      : (header as string[]).flatMap((line) => line.split(/\r?\n/));
   const content = lines.join('\n');
   return content ? `${content}\n\n` : '';
 }

packages/openapi-ts/src/generate/client.ts

@@ -60,9 +60,10 @@ function getClientBundlePaths(pluginName: string): {
  */
 function outputHeaderToPrefix(header: OutputHeader): string {
   if (header == null || typeof header === 'function') return '';
-  const lines = Array.isArray(header)
-    ? header.flatMap((line) => line.split(/\r?\n/))
-    : header.split(/\r?\n/);
+  const lines =
+    typeof header === 'string'
+      ? header.split(/\r?\n/)
+      : header.flatMap((line) => line.split(/\r?\n/));
   const content = lines.join('\n');
   return content ? `${content}\n\n` : '';
 }